This Washable & Reusable Replacement Hoover HEPA Filter fits the following Hoover bagless canisters; S3755, S3765, S3755045, S3765040 and S3755080. Replaces Hoover Part #59134033. The fanfold design reduces resistance to air flow and sits in the dirt cup. This filter should be replaced at least twice a year. Homes with severe breathing issues such as asthma, or homes with severe allergies should replace this filter every 3 months. This is the main filter for the vacuum cleaner, so the more often you replace this filter, the longer your Hoover bagless vacuum will last you. Learn More